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AJNR - American Journal of Neuroradiology

Published ahead of print on October 10, 2007
doi: 10.3174/ajnr.A0772

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American Journal of Neuroradiology 28:2001-2004, November-December 2007
© 2007 American Society of Neuroradiology

Technical Note
BRAIN

3D Time-Resolved Contrast-Enhanced Cerebrovascular MR Angiography with Subsecond Frame Update Times Using Radial k-Space Trajectories and Highly Constrained Projection Reconstruction

Y. Wu^b, N. Kim^a, F.R. Korosec^a,b, A. Turk^a, H.A. Rowley^a, O. Wieben^b, C.A. Mistretta^a,b and P.A. Turski^a

^a Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wis
^b Department of Medical Physics, University of Wisconsin School of Medicine and Public Health, Madison, Wis

Please address correspondence to Patrick A. Turski, MD, Department of Radiology, University of Wisconsin Hospitals and Clinics, Clinical Science Center, 600 Highland Ave, E3/398, Madison, WI 53792; e-mail: PTurski{at}UWHealth.org

SUMMARY: HYPR TRICKS is an acquisition method that combines radial k-space trajectories, sampling k-space at different rates (TRICKS), and a new strategy for image reconstruction that uses highly constrained backprojection reconstruction (HYPR). This approach provides 3D time-resolved contrast-enhanced MR angiograms of the cerebral vessels with subsecond frame update times and submillimeter in-plane spatial resolution. Artifacts are suppressed, and signal-to-noise ratio is well maintained, by using HYPR reconstruction.

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